安卓小案例收集三
Posted guanhang89
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收集三
对话框
public void click1(View v){
//创建对话框创建器
AlertDialog.Builder builder = new Builder(this);
//设置图标
builder.setIcon(android.R.drawable.ic_dialog_alert);
//设置标题
builder.setTitle("警告");
//设置内容
builder.setMessage("欲练此功必先自宫，春晓你确定要自宫吗");
//设置确定按钮
builder.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "自宫完成，谢谢使用", 0).show();
}
});
//设置取消按钮
builder.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "若不自宫，一定不成功", 0).show();
}
});
//显示对话框
AlertDialog ad = builder.create();
ad.show();
}
public void click2(View v){
//创建对话框创建器
AlertDialog.Builder builder = new Builder(this);
//设置图标
builder.setIcon(android.R.drawable.ic_dialog_alert);
//设置标题
builder.setTitle("选择您的家乡");
final String[] items = new String[]{
"火星",
"塞伯坦",
"氪星",
"M78星云",
};
//设置单选选项
builder.setSingleChoiceItems(items, 1, new OnClickListener() {
//dialog:触发此方法执行的那个对话框
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, items[which], 0).show();
//对话框消失
dialog.dismiss();
}
});
//显示对话框
builder.show();
}
public void click3(View v){
//创建对话框创建器
AlertDialog.Builder builder = new Builder(this);
//设置图标
builder.setIcon(android.R.drawable.ic_dialog_alert);
//设置标题
builder.setTitle("选择您需要的武器");
final String[] items = new String[]{
"板凳",
"啤酒瓶",
"开山刀",
"AK-47",
"爱国者",
"唐晓平"
};
final boolean[] checkedItems = new boolean[]{
true,
false,
false,
false,
false,
true
};
//设置多选选项
builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
//记录用户的选择
checkedItems[which] = isChecked;
}
});
builder.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String text = "";
for (int i = 0; i < checkedItems.length; i++) {
text += checkedItems[i]? items[i] + "，": "";
}
Toast.makeText(MainActivity.this, text, 0).show();
}
});
builder.show();
}
public void click4(View v){
//创建进度条对话框
final ProgressDialog dialog = new ProgressDialog(this);
dialog.setIcon(android.R.drawable.ic_input_add);
dialog.setTitle("正在自宫中，请稍候...");
dialog.setMax(100);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
Thread t = new Thread(){
public void run() {
for (int i = 0; i <= 100; i++) {
dialog.setProgress(i);
try {
sleep(20);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//自宫完成，进度消失
dialog.dismiss();
}
};
t.start();
dialog.show();
}多线程下载、断点续传
String path = "http://169.254.88.88:8080/LiebaoFreeWiFi5.1.exe";
int threadCount = 3;
int finishedThread = 0;
//所有线程下载总进度
int downloadProgress = 0;
private ProgressBar pb;
private TextView tv;
Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
tv.setText((long)pb.getProgress() * 100 / pb.getMax() + "%");
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pb = (ProgressBar) findViewById(R.id.pb);
tv = (TextView) findViewById(R.id.tv);
}
public void click(View v){
Thread t = new Thread(){
@Override
public void run() {
//发送http请求，拿到目标文件长度
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(8000);
conn.setReadTimeout(8000);
if(conn.getResponseCode() == 200){
//获取长度
int length = conn.getContentLength();
//创建临时文件
File file = new File(Environment.getExternalStorageDirectory(), getNameFromPath(path));
RandomAccessFile raf = new RandomAccessFile(file, "rwd");
//设置临时文件大小与目标文件一致
raf.setLength(length);
raf.close();
//设置进度条的最大值
pb.setMax(length);
//计算每个线程下载区间
int size = length / threadCount;
for (int id = 0; id < threadCount; id++) {
//计算每个线程下载的开始位置和结束位置
int startIndex = id * size;
int endIndex = (id + 1) * size - 1;
if(id == threadCount - 1){
endIndex = length - 1;
}
System.out.println("线程" + id + "下载的区间：" + startIndex + " ~ " + endIndex);
new DownLoadThread(id, startIndex, endIndex).start();
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
t.start();
}
public String getNameFromPath(String path){
int index = path.lastIndexOf("/");
return path.substring(index + 1);
}
class DownLoadThread extends Thread{
int threadId;
int startIndex;
int endIndex;
public DownLoadThread(int threadId, int startIndex, int endIndex) {
super();
this.threadId = threadId;
this.startIndex = startIndex;
this.endIndex = endIndex;
}
@Override
public void run() {
try {
File fileProgress = new File(Environment.getExternalStorageDirectory(), threadId + ".txt");
int lastProgress = 0;
if(fileProgress.exists()){
//读取进度临时文件中的内容
FileInputStream fis = new FileInputStream(fileProgress);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
//得到上一次下载进度
lastProgress = Integer.parseInt(br.readLine());
//改变下载的开始位置，上一次下过的，这次就不请求了
startIndex += lastProgress;
fis.close();
//把上一次下载进度加到进度条进度中
downloadProgress += lastProgress;
//发送消息，让文本进度条改变
handler.sendEmptyMessage(1);
}
//发送http请求，请求要下载的数据
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(8000);
conn.setReadTimeout(8000);
//设置请求数据的区间
conn.setRequestProperty("Range", "bytes=" + startIndex + "-" + endIndex);
//请求部分数据，成功的响应码是206
if(conn.getResponseCode() == 206){
InputStream is = conn.getInputStream();
byte[] b = new byte[1024];
int len = 0;
//当前线程下载的总进度
int total = lastProgress;
File file = new File(Environment.getExternalStorageDirectory(), getNameFromPath(path));
RandomAccessFile raf = new RandomAccessFile(file, "rwd");
//设置写入的开始位置
raf.seek(startIndex);
while((len = is.read(b)) != -1){
raf.write(b, 0, len);
total += len;
System.out.println("线程" + threadId + "下载了：" + total);
//创建一个进度临时文件，保存下载进度
RandomAccessFile rafProgress = new RandomAccessFile(fileProgress, "rwd");
//每次下载1024个字节，就，就马上把1024写入进度临时文件
rafProgress.write((total + "").getBytes());
rafProgress.close();
//每次下载len个长度的字节，马上把len加到下载进度中，让进度条能反应这len个长度的下载进度
downloadProgress += len;
pb.setProgress(downloadProgress);
//发送消息，让文本进度条改变
handler.sendEmptyMessage(1);
}
raf.close();
System.out.println("线程" + threadId + "下载完毕------------------");
//3条线程全部下载完毕，才去删除进度临时文件
finishedThread++;
synchronized (path) {
if(finishedThread == threadCount){
for (int i = 0; i < threadCount; i++) {
File f = new File(Environment.getExternalStorageDirectory(), i + ".txt");
f.delete();
}
finishedThread = 0;
}
}
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}XUtils的使用
private ProgressBar pb;
private TextView tv_progress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pb = (ProgressBar) findViewById(R.id.pb);
tv_progress = (TextView) findViewById(R.id.tv_progress);
}
public void click(View v){
String url = "http://169.254.244.136:8080/QQPlayer.exe";
HttpUtils utils = new HttpUtils();
utils.download(url, //目标文件的网址
"sdcard/QQPlayer.exe", //指定存储的路径和文件名
true, //是否支持断点续传
true, //如果响应头中包含文件名，下载完成后自动重命名
new RequestCallBack<File>() {
//下载完成后调用
@Override
public void onSuccess(ResponseInfo<File> responseInfo) {
TextView tv_success = (TextView) findViewById(R.id.tv_success);
tv_success.setText(responseInfo.result.getPath());
}
//下载失败调用
@Override
public void onFailure(HttpException error, String msg) {
TextView tv_failure = (TextView) findViewById(R.id.tv_failure);
tv_failure.setText(msg);
}
//下载过程中不断调用
@Override
public void onLoading(long total, long current,
boolean isUploading) {
pb.setMax((int) total);
pb.setProgress((int) current);
tv_progress.setText(current * 100 / total + "%");
}
});
}Activity跳转
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//把“activity_main”这个布局文件能生成的视图界面作为它的上下文。
}
//隐式跳转至打电话Activity
public void click1(View v){
//创建意图，这个是隐式意图
Intent intent = new Intent();
//设置动作
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:110"));
//启动Activity
startActivity(intent);
}
//显式启动SecondActivity
public void click2(View v){
//这个是显式意图
Intent intent = new Intent();
//设置上下文和目标Activity的字节码
intent.setClass(this, SecondActivity.class);
startActivity(intent);
}
//显式启动拨号器
public void click3(View v){
Intent intent = new Intent();
//arg0：目标Activity所在的应用的包名
//arg1：目标Activity的类名，注意要带上包名
intent.setClassName("com.android.dialer", "com.android.dialer.DialtactsActivity");
intent.setData(Uri.parse("tel:11670"));
startActivity(intent);
}
/**
* 隐式启动拨号器
*/
public void click4(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:76115230"));
startActivity(intent);
}
/**
* 隐式启动SecondActivity
*/
public void click5(View v){
Intent intent = new Intent();
intent.setAction("a.b.c");
//匹配mimetype
// intent.setType("text/name");
//匹配scheme
// intent.setData(Uri.parse("heima:春眠不觉晓"));
intent.setDataAndType(Uri.parse("heima:春眠不觉晓"), "text/name");
//如果没有设置Category的匹配，那么自动匹配CATEGORY_DEFAULT
// intent.addCategory(Intent.CATEGORY_DEFAULT);
startActivity(intent);
}
/**
* 显式启动浏览器
*/
public void click6(View v){
Intent intent = new Intent();
intent.setClassName("com.android.browser", "com.android.browser.BrowserActivity");
startActivity(intent);
}
/**
* 隐式启动浏览器
*/
public void click7(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http:www.baidu.com"));
startActivity(intent);
}Intent跳转并携带数据（Intent、Bundle携带）
public void click(View v){
EditText et_malename = (EditText) findViewById(R.id.et_malename);
EditText et_femalename = (EditText) findViewById(R.id.et_femalename);
String maleName = et_malename.getText().toString();
String femaleName = et_femalename.getText().toString();
//跳转到SecondActivity，在second中做姻缘计算
Intent intent = new Intent(this, SecondActivity.class);
//把数据封装至intent中
//intent中可以封装数据，数据有八大基本数据类型和字符串及它们的数组，还有实现了序列化接口的对象，还有bundle对象
// intent.putExtra("maleName", maleName);
// intent.putExtra("femaleName", femaleName);
//Bundle中也可以用键值对封装数据，封装类型与intent一致
Bundle extras = new Bundle();
extras.putString("maleName", maleName);
extras.putString("femaleName", femaleName);
intent.putExtras(extras);
startActivity(intent);
}Activity销毁时传递数据
传递的那个示例：
//显示联系人列表
ListView lv = (ListView) findViewById(R.id.lv);
lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item_listview, R.id.tv, names));
lv.setOnItemClickListener(new OnItemClickListener() {
//position:点击某个条目时，会通过position告诉程序员点击的是哪一个条目
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent data = new Intent();
//把要传递的数据封装至intent中
data.putExtra("name", names[position]);
//当此Activity销毁时，返回至上一个Activity时，会把这个intent对象传递给上一个Activity
setResult(10, data);
//销毁当前Activity
finish();
}
});接收的示例：
public static final int CONTACT = 10;
public static final int SMS = 20;
public static final int HANDLE_EXCEPTION = 30;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void click(View v){
Intent intent = new Intent(this, ContactActivity.class);
//启动一个Activity去获取数据（结果）
startActivityForResult(intent, CONTACT);
}
public void click2(View v){
Intent intent = new Intent(this, SmsActivity.class);
startActivityForResult(intent, SMS);
}
public void click3(View v){
Intent intent = new Intent(this, HandleExceptionActivity.class);
startActivityForResult(intent, HANDLE_EXCEPTION);
}
//只有通过startActivityForResult启动的Activity销毁时，才会回调这个方法，方法中传入的intent就封装了返回的数据
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//通过请求码来判断data来自哪一个Activity
if(requestCode == CONTACT){
String name = data.getStringExtra("name");
EditText et_name = (EditText) findViewById(R.id.et_name);
et_name.setText(name);
}
else if(requestCode == SMS){
String sms = data.getStringExtra("sms");
EditText et_content = (EditText) findViewById(R.id.et_content);
et_content.setText(sms);
}
//先通过请求码判断data来自哪个Activity
else if(requestCode == HANDLE_EXCEPTION){
//通过结果码判断数据data中的数据是什么类型
if(resultCode == 100){
String name = data.getStringExtra("name");
EditText et_name = (EditText) findViewById(R.id.et_name);
et_name.setText(name);
}
else if(resultCode == 200){
String sms = data.getStringExtra("sms");
EditText et_content = (EditText) findViewById(R.id.et_content);
et_content.setText(sms);
}
}
}Receiver案例
ip拨号器示例
public void onReceive(Context context, Intent intent) {
//取出广播中的号码
String number = getResultData();
String newNumber = "17951" + number;
//把修改后的号码放入广播中
setResultData(newNumber);
//拦截是无效的
abortBroadcast();
}短信拦截
public void onReceive(Context context, Intent intent) {
//取出短信内容
Bundle bundle = intent.getExtras();
//数组中的每一个元素，就是一条短信
Object[] objects = (Object[]) bundle.get("pdus");
for (Object object : objects) {
//把数组中的元素转换成短信对象
SmsMessage sms = SmsMessage.createFromPdu((byte[]) object);
//获取对方号码
String address = sms.getOriginatingAddress();
//获取短信内容
String body = sms.getMessageBody();
System.out.println(address + ";" + body);
if("13888".equals(address)){
//拦截短信
abortBroadcast();
}
}
}SD卡状态监听
public void onReceive(Context context, Intent intent) {
//判断收到的是神马广播
//获取广播中的action
String action = intent.getAction();
if(Intent.ACTION_MEDIA_MOUNTED.equals(action)){
Toast.makeText(context, "sd卡就绪", 0).show();
}
else if(Intent.ACTION_MEDIA_REMOVED.equals(action)){
Toast.makeText(context, "sd卡被拔出了", 0).show();
}
else if(Intent.ACTION_MEDIA_UNMOUNTED.equals(action)){
Toast.makeText(context, "sd卡被卸载了", 0).show();
}
}流氓软件
@Override
public void onReceive(Context context, Intent intent) {
//启动勒索应用
Intent it = new Intent(context, MainActivity.class);
//创建新的任务栈，因为这行代码执行时，没有任务栈
it.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(it);
}应用的安装卸载监听
public void onReceive(Context context, Intent intent) {
//判断收到的是什么广播
String action = intent.getAction();
//获取安装更新卸载的是什么应用
Uri uri = intent.getData();
if(Intent.ACTION_PACKAGE_ADDED.equals(action)){
Toast.makeText(context, uri + "被安装了", 0).show();
}
else if(Intent.ACTION_PACKAGE_REMOVED.equals(action)){
Toast.makeText(context, uri + "被删除了", 0).show();
}
else if(Intent.ACTION_PACKAGE_REPLACED.equals(action)){
Toast.makeText(context, uri + "被更新了", 0).show();
}
}发送无序广播
public void click(View v){
Intent intent = new Intent();
intent.setAction("a.b.c");
//发送自定义无序广播
sendBroadcast(intent);
}接收：
<receiver android:name="com.itheima.receivecustombroadcast.MyReceiver">
<intent-filter >
<action android:name="a.b.c"/>
</intent-filter>
</receiver>优先级及最终接受者
public void click(View v){
Intent intent = new Intent();
intent.setAction("com.center.fdm");
//发送自定义有序广播
//resultReceiver：在所有广播接收者都收到广播之后，才会收到，一定是最后一个收到，并且一定能收到
sendOrderedBroadcast(intent, null, new MyReceiver(), null, 0, "每人发100斤大米", null);
}
class MyReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
String order = getResultData();
System.out.println("反贪局收到文件：" + order);
}
}配置优先级：
<receiver android:name="com.itheima.local.ShengZF">
<intent-filter android:priority="1000">
<action android:name="com.center.fdm"/>
</intent-filter>
</receiver>
<receiver android:name="com.itheima.local.ShiZF">
<intent-filter android:priority="800">
<action android:name="com.center.fdm"/>
</intent-filter>
</receiver>
<receiver android:name="com.itheima.local.XianZF">
<intent-filter android:priority="600">
<action android:name="com.center.fdm"/>
</intent-filter>服务
启动停止：
public void start(View v){
//启动服务
Intent intent = new Intent(this, MyService.class);
startService(intent);
}
public void stop(View v){
//停止服务
Intent intent = new Intent(this, MyService.class);
stopService(intent);
}电话录音服务
private MediaRecorder recorder;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
super.onCreate();
//获取电话管理器
TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
//监听电话状态
tm.listen(new MyListener(), PhoneStateListener.LISTEN_CALL_STATE);
}
class MyListener extends PhoneStateListener{
//电话状态改变时回调
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
//判断当前是什么状态
switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
if(recorder != null){
System.out.println("停止录音");
//停止录音
recorder.stop();
//释放录音机占用的资源
recorder.release();
recorder = null;
}
break;
case TelephonyManager.CALL_STATE_RINGING:
if(recorder == null){
recorder = new MediaRecorder();
//设置音频来源
recorder.setAudiosource(MediaRecorder.AudioSource.MIC);
//设置输出格式
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile("sdcard/voice.3gp");
//设置音频编码
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
System.out.println("准备好");
recorder.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
if(recorder != null){
System.out.println("开始录音");
recorder.start();
}
break;
}
}
}服务的两种启动方式
private MyConn conn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
conn = new MyConn();
}
public void start(View v){
//这些都是显示启动
Intent intent = new Intent(this, MyService.class);
startService(intent);
}
public void stop(View v){
Intent intent = new Intent(this, MyService.class);
stopService(intent);
}
public void bind(View v){
Intent intent = new Intent(this, MyService.class);
//绑定服务
bindService(intent, conn, BIND_AUTO_CREATE);
}
public void unbind(View v){
//解绑服务
unbindService(conn);
}
class MyConn implements ServiceConnection{
//到服务的连接被建立了，此方法调用
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
}
//到服务的连接中断了，此方法调用
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
}
public void jump(View v){
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}中间人服务
接口层：
public interface PublicBusiness {
void qianXian();
}
Service：
public class LeaderService extends Service {
@Override
public IBinder onBind(Intent intent) {
// 返回中间人对象
return new FengMiShu();
}
class FengMiShu extends Binder implements PublicBusiness{
//中间人的牵线
@Override
public void qianXian(){
//调用领导的办证
banZheng();
}
public void takeSoap(){
}
}
public void banZheng(){
System.out.println("成功办证");
}
}调用服务：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//服务是需要通过intent来实现的。
Intent intent = new Intent(this, LeaderService.class);
bindService(intent, new ServiceConnection() {
//连接因为异常而终止才会调用
@Override
public void onServiceDisconnected(ComponentName name) {
}
//onBind有返回值此方法才会调用
//service:这个对象就是onBind返回的中间人
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
pb = (PublicBusiness) service;
}
}, BIND_AUTO_CREATE);
}
public void click(View v){
pb.qianXian();
}音乐播放
接口：
public interface ControllerInterface {
void play();
void pause();
}服务：
public class MusicService extends Service {
@Override
public IBinder onBind(Intent intent) {
return new MusicController();
}
class MusicController extends Binder implements ControllerInterface{
@Override
public void play() {
MusicService.this.play();
}
@Override
public void pause() {
MusicService.this.pause();
}
}
public void play(){
System.out.println("开始播放音乐");
}
public void pause(){
System.out.println("暂停播放音乐");
}
}调用：
public class MainActivity extends Activity {
ControllerInterface ci;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, MusicService.class);
//把进程变成服务进程，这样可以后台播放
startService(intent);
//绑定服务获取中间人对象
bindService(intent, new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
ci = (ControllerInterface) service;
}
}, BIND_AUTO_CREATE);
}
public void play(View v){
ci.play();
}
public void pause(View v){
ci.pause();
}
}通过服务手动启动广播接受者
public class RegisterService extends Service {
private ScreenOnOFFReceiver receiver;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
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